2221538 has 16 divisors (see below), whose sum is σ = 3659040. Its totient is φ = 1003200.

The previous prime is 2221523. The next prime is 2221567. The reversal of 2221538 is 8351222.

2221538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5093 + ... + 5511.

It is an arithmetic number, because the mean of its divisors is an integer number (228690).

2^2221538 is an apocalyptic number.

2221538 is a deficient number, since it is larger than the sum of its proper divisors (1437502).

2221538 is a wasteful number, since it uses less digits than its factorization.

2221538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673.

The product of its digits is 960, while the sum is 23.

The square root of 2221538 is about 1490.4824722217. The cubic root of 2221538 is about 130.4821934670.

The spelling of 2221538 in words is "two million, two hundred twenty-one thousand, five hundred thirty-eight".